Is 15000 engine hours a lot?
How many engine hours is a lot? Engines with over 15,000 hours may require significant repairs or overhauls. High engine hours generally start around 10,000, depending on the engine’s type and maintenance history. Many lycoming engines, for example, have an hourly tbo of 2,000 hours and a calendar tbo of 12 years. If an engine has only 300 hours but 20 years have passed since its last overhaul, it is likely in need of an overhaul. These intervals are based on extensive engine testing and years of field experience.